5209945 has 8 divisors (see below), whose sum is σ = 6732936. Its totient is φ = 3847296.

The previous prime is 5209943. The next prime is 5209951. The reversal of 5209945 is 5499025.

It can be written as a sum of positive squares in 4 ways, for example, as 1157776 + 4052169 = 1076^2 + 2013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5209945 - 2¹ = 5209943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5209945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5209943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40012 + ... + 40141.

It is an arithmetic number, because the mean of its divisors is an integer number (841617).

Almost surely, 2^5209945 is an apocalyptic number.

It is an amenable number.

5209945 is a deficient number, since it is larger than the sum of its proper divisors (1522991).

5209945 is a wasteful number, since it uses less digits than its factorization.

5209945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80171.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 5209945 is about 2282.5303941021. The cubic root of 5209945 is about 173.3581962198.

The spelling of 5209945 in words is "five million, two hundred nine thousand, nine hundred forty-five".